Clutch member.



E. M. COOK. CLUTCH MEMBER. APPLICATION FILED SEPT. 17, 1906.

Patented Aug. 3, 1909.

ANDREW. I. cum on. nmqrmmms. WAMW. n c.

EDWARD M. COOK, OF OBERLIN, OHIO.

CLUTCH MEMBER.

Specification of Letters Patent.

Application filed September 17, 1906.

Patented Aug. 3, 1909.

Serial No. 334,857.

T all whom it may concern:

Be it known that I, EDWARD M. Coon, a citizen of the United States ofAmerica, residing at Oberlin, in the county of Lorain and State of Ohio,have invented new and useful Improvements in Clutch Members, of whichthe following is a specification.

This invention relates to clutch members designed especially for use inconjunction with belt pulleys for fixing the latter on a driving shaft,and has for its objects to pro- I duce a comparatively simpleinexpensive device of this character which may be readily installed foruse, one which may be conveniently manipulated for clutching orreleasing the pulley, and one whereby the pulley may be securely fixedfor rotation with the shaft when circumstances require.

Vith these and other objects in view, the invention comprises the novelfeatures of construction and combination of parts more fully hereinafterdescribed.

In the accompanying drawings: Figure 1 is a front sectional elevation ofadevice embodying the invention, the section being taken on the line 1-1of Fig. 2. Fig. 2 is a vertical cross section taken on the line 22 ofFig. 1. Fig. 3 is a detail view of the clutch operating screw.

teferring to the drawings, 1 designates a power shaft on which is idlymounted a drum or pulley 2 of hollow formation presenting an annularchamber 3 bounded by a marginal or peripheral wall 4 constituting thebelt receiving surface of the pulley.

Fitted in the chamber 3 is a clutch member or head 5 having a pair ofrelatively movable spring clutching portions or arms 6 terminally spacedas at 7 and provided with a cylindrical, tubular hub S fixed on theshaft 1 through the medium of a spline or feather 9, while slidablydisposed on the hub S and fixed for rotation therewith through themedium of a spline or feather 10 is an operating head or collar 11provided with a peripheral groove or channel 12 permitting engagement ofa suitable operating lever with the collar.

Formed at the ends of the spring clutch portions or arms 6 are heads orenlargements 13 having non-circular recesses 13 for the reception ofinternally threaded nuts 14 retained in place by means of cap plates 15in turn secured through the medium of screw bolts 16. The plates aredisposed in shallow recesses 15 in the front surfaces] without of theheads, and the right-angularly disposed walls 15 of the shallow recessesengage the plates and thus cooperate with the screw bolt 16 to hold theplates firmly in pos tion over the nuts 1st. Engaged with the nuts 1%are the reversely threaded port-ions 17 of a rotary expanding member orscrew provided with a fixed outwardly projecting crank portion or arm 18to the outer end of which there is pivoted one end of :1 connectingelement or link 19 having its other end pivoted between a pair of ears20 formed on the collar 11.

in practice, when the collar 11 is moved forwardly on the hub S, the arm18 will, tnrough the medium of link 19, be swung upwardly therebyrotating the expanding member or screw for causing the threaded portions17 to act in conjunction with the nuts 1% for spreading the arms 6relatively and forcing them into secure clutching engagement. with themarginal wall a of the pulley, thus to fix the latter for rotation withthe shaft 1. It will be understood, of course, that reverse movement ofthe collar 11 on the hub serves for rotating the screw in the oppositedirection, thereby drawing the portions 6 of the clutch head toward eachother for releasing the pulley, and further, that the parts 17 of thescrew are threaded in relatively reverse directions whereby they operatein conjunction with the nuts 1-1 for moving the clutch arms 6 toward andfrom each other on proper rotation of the screw.

The present construction admits of a ready adjustment to compensate forwear of the spring members 6. It is merely nec essary to remove theplates 15 and withdraw the screw 17 and nuts 1% forwardly and turn thenuts a quarter, half or three quarter turn, and replace them in therecesses and restore the plates 15. By thus changing the relation of thenuts let with the screw 17, the members 6 can be spread so that theclutch will be set by the regular movement of the part 12.

When necessary or desirable, an additional belt pulley 21 may bearranged on the hub of the pulley 2 and fixed for rotation therewith bymeans of a spline 22, as illustrated in Fig. 2.

By arranging the nuts 14 in recesses in the manner set forth andretaining the nuts in position by the plates 15, it is possible toreadily replace the nuts or operating screw entirely dismantling theclutch.

For this purpose, it is merely necessary to remove the pivot between theparts 18 and 19 and unfasten the bolts 16 for permitting the plates 15to be taken out, whereupon the operating screw with the nuts thereon canbe removed forwardly. New nuts can then be applied to the screw or a newscrew substitutedin case of wear or breakage, and the parts reassembledin a simple an expeditious manner.

Having thus described my invention, what I claim is:

An apparatus of the character described comprising a shaft with a drumthereon, a clutch member provided with a hub having arms, said armsprovided with terminal enlargements having polygonal recesses thereinwhich are open at one side and also at the end faces thereof, saidenlargements being also provided with recesses of a less depth and of agreater area than the poly onal recesses and arranged in alinementtherewith, internally threaded nut-s fitting in the said polygonalrecesses and removable in a direction parallel with the axis of andthrough said recesses of less depth and greater area, and having capplates fitted therein to hold the said nuts in position, bolts forsecuring said cap plates, a rotary expanding member having reverselythreaded portions engaged by said nuts and pro vided with a crank armhaving one end of a link pivoted thereto, a collar slidably mounted onthe hub having means thereon to which'the other end of said link ispivoted, whereby said arms and their enlargements are permitted tofrictionally engage the internal surfaces of the drum.

In testimony whereof, I afliX my signature in presence of two witnesses.

. EDWVARD M. COOK. Witnesses CHARLES S. HAMMOND, VILLIS A. HART.

